Structure 1.5 Ideal gases

Structure 1.5.1 and 1.5.2
Understandings:

An ideal gas consists of moving particles with negligible volume and no intermolecular forces. All collisions between particles are considered elastic.
Real gases deviate from the ideal gas model, particularly at low temperature and high pressure.

Learning outcomes:

This video covers the properties of ideal gases and the conditions at which real gases devaiate from ideal gas behaviour.

Structure 1.5.3
Understandings:

The molar volume of an ideal gas is a constant at a specific temperature and pressure.

Learning outcomes:

Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.

Additional notes:

The names of specific gas laws will not be assessed.
The value for the molar volume of an ideal gas under standard temperature and pressure (STP) is given in the data booklet.

Linking questions:

Reactivity 2.2 Graphs can be presented as sketches or as accurately plotted data points. What are the advantages and limitations of each representation?

This video covers the molar volume of a gas at STP.

This video covers the gas laws including the combined gas law.

This video covers examples involving the gas laws.

Structure 1.5.4
Understandings:

The relationship between the pressure, volume, temperature and amount of an ideal gas is shown in the ideal gas equation PV = nRT and the combined gas law.

Learning outcomes:

Additional notes:

Units of volume and pressure should be SI only. The value of the gas constant R, the ideal gas equation, and the combined gas law, are given in the data booklet.

This video covers calculations using the ideal gas equation.